If you want to argue that increased visibility is reason enough for its existence, then you're arguing in favor of every single copy and paste job on the internet. If so, that's your opinion - there are definite benefits for increasing quantity. But I wholeheartedly disagree that it is good.
To be painfully specific why, it's making a static copy of something from a site which was built because static answers were deemed bad, and it's splitting the feedback for little or no gain (note how there are more possibly-valuable responses in Ars' comments, but they're not on SE).
That it was apparently done by Stack Exchange is even weirder - they're willfully contributing to data-rot, when one of their major reasons for existence is to prevent it. It has already fallen behind the original answer, which has some significant edits since this was posted.